Анотация: The use of applications for noise reduction often changes the characteristics of the input signal. The successful methods for eliminating noise unfortunately require high computational complexity, and thus the process of obtaining the final result is slow. The present article studies a model demonstrating the cording signal of human speech, visualizing the noise in signal and its reduction through the Matlab application. It is necessary to definite the level of detail for performance of each step of the algorithm, as well as the provisions for possible exits and rules for making decisions. An ongoing analysis of the processes occurring during the execution algorithm is carried out. Intuitionistic fuzzy sets are used to estimate noise reduction in speech